P0C20

Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit/Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Transmission transition to emergency mode
Reduced vehicle performance
Unusual noises from the transmission area
Gear shifting problems

Causes

Open circuit in the pump phase circuit
Electrical transmission fluid pump malfunction
Problems with the wiring harness or connectors
Transmission control module (TCM) failure
Short circuit in the circuit

How to Fix

Check the integrity of the phase circuit U-V-W
Inspect the wiring harness and connectors for damage.
Check the functionality of the electric pump
Test the transmission control module (TCM)
Replace faulty components

Related codes

P0C21 P0C22 P0C23